"Jamie Hyneman and Adam Savage are hosts of the scientific experimentation show, which airs on The Discovery Channel. The pair was reportedly trying to figure out how fast a cannonball would travel, when it misfired and shot hundreds of feet in the air.

“This cannonball was supposed to go through several barrels of water and through a cinder block, and then ultimately into the side of the hill,” said J.D. Nelson of the Alameda County Sheriff’s Department.

Instead the cannonball flew over the foothills surrounding Camp Parks Military Firing Reservation, before spiraling back toward Dublin like a cruise missile.

It flew straight through the front door of a home on Cassata Place, and bounced around like a pinball, flying up to the second floor before blasting through a back bedroom wall."(CBS LA)